<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
<script>
var foo= 'get-element-by-id';
function translate(res) {
var arr = res.split("-"); // 以-为分隔符截取字符串，返回数组
for(var i = 1; i < arr.length; i++) {
arr[i] = arr[i].charAt(0).toUpperCase() + arr[i].slice(1);
}
res= arr.join(""); // 返回字符串
return res;
}
console.log(translate(foo))
</script>
</html>